Movement regulating arrangement



June 21, 1960 H. JUNGHANS ETAL 2,941,417

MOVEMENT REGULATING ARRANGEMENT Filed Jan. 23, 1957 2,941,417 MOVEMENTREGULATING ARRANGEMENT Helmut Junghans and Kurt Biiu'erle,Schra'mberg-Sulgen, Germany, assignors to Gebruder Junglrans A.G.,Schram'berg KreiS Rottweil, Germany Filed Jan. 23, 1957, Ser. No.635,662

Claims priority, application Germany Jan. 24, '1956 6 Claims. (Cl. 74-527) The invention relates 'to a movement regulating arrangement with anoscillating system comprising a permanent magnet and a spring andcontrolling a magnetic escapement wheel. Such movement regulatingarrangements are described, for example, in the Clilford German patentspecifications Nos. 809,420; 812,615; 914.837-and United States Patent916,160. The present invention deals with improvements in theconstruction of the magnet as well as the whole arrangement of themovement regulator and the design of the adjusting and regulating means.In particular, the invention has for its object to produce a movementregulating arrangement in the form of an independent group of parts(so-called escapement). In the manufacture of permanent magnets, whichare preferably of U-shape with the ends of the U-arms directed inwardsin order to form facing vpole end faces, difficulties have beenencountered owing to the fact that the high-alloy cobalt-magnet steelplate employed could only be stamped with an exceptional amount of wearon the tools, if at all. It has been found that this objection can besuccessfully overcome by building up the permanent magnet from at leasttwo at least partly congruent laminae. When stamping the thin plates,the wear on the tools remains within economically acceptable limits.

In the case of magnetic movement regulators of the type here coming intoquestion, it has already been proposed to fit a safety finger near themagnet poles as safety device against getting out of step in the eventof jolts, overwinding of the driving spring and the like, which fingerunder normal running conditions, descends between the poles of theescapement wheel without touching them and has as its object to catch onthe pole teeth of the escapement wheel in the event of its getting outof step. The making of the permanent magnet from thin laminae nowrenders it possible to stamp out the preferably dove-tailed recesses onthe pole arms for receiving a non-magnetic bridge provided with suitablefixing lugs and the middle, preferably curved portion of which forms thepassage safety member for the escapement wheel. In spite of the hardnessof the steel plate from which the magnet is made, a convenientcombination between magnet and safety member from the point of view ofmanufacturing technique is produced inthis manner.

The oscillating system composed of a magnet and a spring, is fixed onthe frame of the movement regulator or the train of gears coordinatedthereto by means of a support which, according to the teaching of theClifford German patent specification No. 809,420 is locatedapproximately in the centre of gravity of the oscillating system or nearan axis which passes through the centre of gravity. For mass productionit has been found advisable according to the invention, to fix thesupport on the bearing frame of the movement regulator so that it canturn about an axis extending parallel to the axis of the escapementwheel. By turning the oscillating system about its axis of support thedepth to which the ice magnet .poles dip in relation to the escapementwheel can.

ing the oscillating spring. As in the case of the screw beingunintentionally screwed home too far the oscillating system or theescapement wheel might become :damaged, it is proposed, according to theinvention, to

mount an eccentric bolt rotatable in the frame plate, in stead of usingthe micrometer screw. This arrangement presents the advantage that itenables very fine regulation and moreover ensures that the bolt, whenthe magnetis arranged accordingly, cannot be so far advanced that itcomes into contact with the magnet.

In order to facilitate both the assembly and also in particular thefitting of timepiece movements with a movement regulating arrangementaccording to the invention, the oscillating system can, according to afurther feature of the invention, be accommodated together with theescapement wheel and also at least one gear wheel connected up in seriestherewith, or preferably two such wheels, in a special movement framecomposed of two movement plates and spacing posts, the movement framebeing provided with connecting means for mounting on a movement frame(time movement) comprising the driving spring, the remaining parts ofthe chain of gears controlling the movement regulator, the hand drivinggear and, if necessary, other gears such as for example striking oralarm gears, in such a manner that the movement plates lie in pairsapproximately in the same planes.

Magnet movement regulating arrangements of the type here coming intoquestion are somewhat sensitive to fluctuations in power. This appliesparticlarly to 8- day timepieces. According to a preferred form ofconstruction of the invention a power compensating device known per se,can be fitted in the chain of gears between the driving spring and themovement regulating arrangement; a suitable device is shown in theClifford German patent specification No. 875,592.

Other features and advantages of the invention will become apparent fromthe following description of one form of construction, from theaccompanying drawings and from the claims.

-In the drawings:

Fig. 1 is a perspective view of the permanent magnet;

Fig. 2 shows in a similar View to Fig. 1 the bridgeshaped passage safetymember;

Fig. 3 is a side elevation of the movement regulating arrangement withthe front plate of the movement removed, and

Fig. 4 is a top plan view of Fig. 3.

As can be seen from Fig. 1, the permanent magnet as a whole isdesignated by 10 and composed of two congruent laminae 1-1 and 12. Themagnet body 10 is of substantially U-shape, the ends of the pole arms10a and 10b being directed inwards and form opposite pole end faces 10cand 10d. To enable the magnet to be connected with the oscillatingspring 13 (-Figs. 3 and 4) the magnet laminae have two punched holes10e. Dovetailed recesses 10] and 10g are formed in the ends of themagnet arms 10a and 10b. These recesses serve for receiving rivet lugs15a and 15b formed on a bridgeshaped non-ferrous part designated as awhole by 15, which part is riveted to the magnet lamina packet andserves to catch with its curved middle part 15c the escapement wheel 16by its pole teeth 16a, when it is about to fall out of step with theoscillating system composed of the magnet and oscillating spring 13, forexample in the event-of a jolt.

The oscillating spring 13 is provided with a tongue 13a by means ofwhich it is fixed by a screw on the support 17, the support consists forexample of section brass and has a turned pin 17a by means of which itis riveted to the movement plate 19 with an interposed friction washer18. The support has a transverse bore 17b to enable the introduction ofa long pin from the side, with the aid of which pin the support can beadjusted very accurately in relation to the escapement wheel 16 forregulating the distance of penetration of the magnet poles 10c and 10d.

For the precision adjustment of the movement an eccentric-bolt 20 madeof iron is turnable about its shank 20a in the movement plate 19. On theouter end of the We claim:

1. Movement regulating device with an oscillating systemcomprising-apermanent magnet and a spring for '3 controlling anescapement wheel, the permanent magnet being U-shaped in plan and iscomposed of at least two at least partly congruent laminae constitutedby a material in the form of layers, said layers having recesses withinone edge thereof, and a reinforcement member fitted on the magnet andsecured in the recesses and co operating with an escapement wheel, thepermanent magnet having its end faces opposite each other, thereinforcement member being composed of non-magnetic bridge provided withdepending lugs by means of which it is secured in the recesses.

2. Movement regulating device according to claim 1, in which therecesses each have a swallow-tail configuration.

3. A magnet for use in a magnetic escapement mechanism for an electricclock comprising a U-shaped member in plan composed of at least two atleast partly congruent laminae in the form of layers, each layer having'recesses within one edgethereof, and a bridge rein forcement membersecured in the recesses and composed of a non-magnetic bridge providedwith depending lugs by means of which it is secured in the recesses.

4. A magnet for use in a Clifford magnetic escapement mechanismcomprising'a U-shaped member in plan composed of at least two at leastpartly congruent laminae in the form of layers with each layer providedwith at least two recesses in the outer ends of the legs of the U, and abridge reinforcement member secured in the recesses andcomposed of anon-magnetic bridge material across the outerends of the legs, saidbridge being secured in the recesses by means on the bridge.

5. Amagnet according to claim 4, in which the means on the bridge beingin the form of lugs secured'in the recesses.

6. A-rmagn'et according to claim 4, in which the U- shaped congruentlaminae are stamped, out from the material from which they are made.

i References Cited in the file of this patent 536,919 I Great BritainMay 30,

